/*
 * OREKIT-X
 * Copyright 2002-2008 CS Communication & Systemes
 * 
 * Parts of this software package have been licensed to CS
 * Communication & Systemes (CS) under one or more contributor license
 * agreements.  See the NOTICE file distributed with this work for
 * additional information.
 *  
 * This is an experimental copy of OREKIT from www.orekit.org.
 * Please use the original OREKIT from orekit.org for normal work
 * unrelated to this research project.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License.  You
 * may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 */
package ore.forces.radiation;

import ore.SpacecraftState;

import org.apache.commons.math.geometry.Vector3D;


/** 
 * Interface for spacecraft that are sensitive to radiation pressure
 * forces.
 *
 * @author Fabien Maussion
 * @author Luc Maisonobe
 */
public interface RadiationSensitive 
    extends java.io.Serializable
{
    /** 
     * @param state current state information: date, kinematics, attitude
     * @param direction direction of the light flux in the spacecraft frame
     * 
     * @return Surface cross section sensitive to radiation pressure (m<sup>2</sup>)
     */
    public double getRadiationCrossSection(SpacecraftState state, Vector3D direction);
    /** 
     * @param state current state information: date, kinematics, attitude
     * @param direction direction of the light flux in the spacecraft frame
     * 
     * @return Absorption coefficients vector in the spacecraft frame
     */
    public Vector3D getAbsorptionCoef(SpacecraftState state, Vector3D direction);
    /** 
     * @param state current state information: date, kinematics, attitude
     * @param direction direction of the light flux in the spacecraft frame
     * 
     * @return Specular reflection coefficients vector in the spacecraft frame
     */
    public Vector3D getReflectionCoef(SpacecraftState state, Vector3D direction);

}
